Cascade Definition and 27 Threads

Links: LTSpice Pre-amp schematic (resistor values/capacitor values different) Gerber Op-amp Datasheet Hi all; Presently designing pre-amp for my analogue MEMS microphone for bioacoustic recording (ultrasonic, especially.) Don't own an oscilloscope, so relying on spectrograms of audio for...

Here is a common CE-CC cascade amplifier- Here, the output of the emitter amplifier is directly connected to Q2, without any coupling capacitor or any voltage divider bias. This may harm the base-emitter junction of Q2 in case of unwanted output voltage from Q1 collector. But in that case, the...

In my limited understanding of the quantum measurement problem, I am imagining the whole thing as corresponding to a kind of "weighting down" by a cascade of entaglement. Here is my very simple understanding of the quantum measurement problem: A waveform (Schrödinger equation) describes the...

Summary:: What is the structure and how are minibands and minigaps in QC Lasers implemented Hello everybody, I have a question regarding the miniband and minigaps that are displayed widely in diagrams about the functioning of Quantum Cascade Lasers. How are this mini-gaps established...

This cascade is divided into 3 sections thus: the leftmost section is an emitter follower : Ib1 = (15V-0.7V)/ ( R1 + 151R2) IE1= 151*Ib1 re1= 26mV /(IE1) Zb1= 150( re1+ R2) AV1= (-150*R1)/ (R1+Zb1) the center section is an unbiassed BJT : Ib2 = (15V-0.7V)/ ( R3 + 151(R4+Re2a) ) IE2=...

hi Just a little question. How does one calculate the power of a QCL by theory? Is there any free software that allows one to calculate the power of a inputted laser medium for a qcl? Thanks. Adrian

Hello I am struggling to understand the concept of Quantum cascade lasers. I am doing research on a 20 period In0.33Ga0.67As (3.1 nm)/Al0.90In0.10As (7.2 nm) superlattice and would like to fully understand how a quantum cascade laser works. I also have not taken quantum mechanics yet so I...

Homework Statement http://imgur.com/qBXvrGz Above is a sketch of the circuit, a two stage symmetrical attenuator consisting of two symmetrical T attenuator pads connected in cascade, with the values that I have worked out for the resistors. The reduction is 15dB in the first stage, and 8dB in...

I know that the Cascade Refrigeration Systems are more efficient than the normal Refrigeration Systems, but I still don't know why?

Homework Statement A calorimeter is made from layers of lead (1.75mm thick) alternated with layers of scintillator. The radiation length ##X_0## of lead is ##0.64cm##. In an EM shower the number of particles doubles and the energy of each particle halves per radiation length travelled. The...

Since we often get comments on US Volcanoes, particularly those in California, Oregon and Washington State, I thought it would be worthwhile to have a separate Cascade Volcano thread. USGS has a Cascade Volcano Observatory. http://volcanoes.usgs.gov/observatories/cvo/ There is also a site on...

As far as I know first entanglement experiment used polarization entangled photons from atomic cascade. As I understand atomic cascade produces entangled photons from two electrons that emit photons by falling from the same orbital to the same lower orbital (so they have the same spin). Now it...

In cumulative cascade connection of two induction motors, why does the net speed reduce? Also, how are the torques of the two motors in the same direction?

Does anyone know if it is possible to get on web an exam sample or quiz or exercises, on "Quantum cascade lasers"? Thank you.

http://www.pbs.org/wgbh/nova/physics/reaching-ultra-low-temperatures.html is this thing accurate? It uses methylene chloride as first refrigerant, then ethene, and then oxygen, and gets to liquefy air...down to 70kelvins after researching the very small info on the net about cascade...

How are these pictures taken of the electron wave function without the wave function collapsing? Does this mean that electron wave functions are real waves after all? Wikipedia Quantum cascade laser will give you the discription

Why for quantum cascade lasers used only intersubband transitions in the conduction band. Although in a heterostructure there are also quantized levels in the valence band, which I think also can be used for lasing? Thank you.

Hi, I am taking a course in Microwave Engineering and we were given the following problem to solve An amplifier with a gain of 12 dB, a bandwidth of 150 MHz, and a noise figure of 4 dB feeds a receiver with a noise temperature of 900 K. Find the noise figure of the overall system. Need I to use...

Hi, I've been trying to understand a simulation for a collision cascade. The PhD that produced this code says that he is modelling a 10keV collision in Fe. From this he says that his PKA velocity is 2620.579 ang/ps or 262057.9 m/s and I'm wondering how did he get this? I've assumed that the...

Homework Statement two identical CS amplifiers connected in cascade. 1st stage fed with vsigand Rsig=100k ohm. load RL= 10k ohm connected to drain of 2nd stage. each MOSFET biased at ID = 0.25mA and VOV=0.25V. assume VA is very large. Each stage has RD=10k ohm. a) sketch equivalent circuit of...

Got cascade voltage transformer made from two completely identical units. On secondary winding, load takes I2=1A Number of compensation and secondary windings is equal. I need to find current trough compensation winding Ic . θ1 = θ2 --> θ1 = I1N1 + IcNc - I2N2 --> θ2 = I1N1 - IcNc --> I2N2...

I need help on how to cascade two or three Jfet transistor and the calculation of the values to have a good amount of gain. The cascade also should help in providing good linearity, have less distortion and should stable good stability.Thanks, good help will really be appreciated by me.

Building a Particle Accelerator Hi, I just stumbled upon these forums and joined with the hopes that I could seek some help from some more experienced people. Thank you for your time. http://bigthink.com/ideas/19050 http://bt.pa.msu.edu/pub/papers/steeremsc/steeremsc.pdf...

i want to design cascade buck converter,but I'm kinda confuse about the controller that i'll use for the converter...there are 2 options, i make the controller independent from 1 converter to another, or i just make the controller dependent, it means that i have only 1 controller for all...

Can somebody help me to find this kind of circuit.im really appreciete your help Specification Only one bjt,one opamp ua741 and asingle power supply of 12v must be used. A 10k ohm load and an input signal will be connected via capacitors to the amplifier. The max voltage gain is about...

Hi Experts :smile: Finally I think I found the correct space to assist me from experts. I need urgent help from u pp about the Cascade Cooler. We r doing a project in our college as final year BE, Mechanical students in India. We have choosen to Design the Cascade cooler which is used...

Hello all, I have been doing some research into alternative energy sources when I came across this interesting principle called the electron cascade effect. Apparently, it allows one to draw energy from the ambient air particles. Here are some links I found concerning it. What do you all...